author | kvn |
Thu, 27 May 2010 18:01:56 -0700 | |
changeset 5694 | 1e0532a6abff |
parent 3908 | 24b55ad4c228 |
child 5547 | f4b087cbb361 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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// Tasks for parallel compaction of the old generation |
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// |
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// Tasks are created and enqueued on a task queue. The |
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// tasks for parallel old collector for marking objects |
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// are MarkFromRootsTask and ThreadRootsMarkingTask. |
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// |
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// MarkFromRootsTask's are created |
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// with a root group (e.g., jni_handles) and when the do_it() |
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// method of a MarkFromRootsTask is executed, it starts marking |
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// form it's root group. |
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// |
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// ThreadRootsMarkingTask's are created for each Java thread. When |
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// the do_it() method of a ThreadRootsMarkingTask is executed, it |
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// starts marking from the thread's roots. |
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// |
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// The enqueuing of the MarkFromRootsTask and ThreadRootsMarkingTask |
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// do little more than create the task and put it on a queue. The |
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// queue is a GCTaskQueue and threads steal tasks from this GCTaskQueue. |
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// |
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// In addition to the MarkFromRootsTask and ThreadRootsMarkingTask |
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// tasks there are StealMarkingTask tasks. The StealMarkingTask's |
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// steal a reference from the marking stack of another |
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// thread and transitively marks the object of the reference |
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// and internal references. After successfully stealing a reference |
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// and marking it, the StealMarkingTask drains its marking stack |
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// stack before attempting another steal. |
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// |
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// ThreadRootsMarkingTask |
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// |
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// This task marks from the roots of a single thread. This task |
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// enables marking of thread roots in parallel. |
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// |
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class ParallelTaskTerminator; |
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class ThreadRootsMarkingTask : public GCTask { |
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private: |
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JavaThread* _java_thread; |
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VMThread* _vm_thread; |
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public: |
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ThreadRootsMarkingTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {} |
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ThreadRootsMarkingTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {} |
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char* name() { return (char *)"thread-roots-marking-task"; } |
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virtual void do_it(GCTaskManager* manager, uint which); |
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}; |
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// |
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// MarkFromRootsTask |
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// |
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// This task marks from all the roots to all live |
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// objects. |
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// |
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// |
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class MarkFromRootsTask : public GCTask { |
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public: |
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enum RootType { |
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universe = 1, |
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jni_handles = 2, |
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threads = 3, |
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object_synchronizer = 4, |
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flat_profiler = 5, |
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management = 6, |
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jvmti = 7, |
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system_dictionary = 8, |
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vm_symbols = 9, |
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reference_processing = 10, |
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code_cache = 11 |
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}; |
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private: |
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RootType _root_type; |
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public: |
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MarkFromRootsTask(RootType value) : _root_type(value) {} |
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char* name() { return (char *)"mark-from-roots-task"; } |
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virtual void do_it(GCTaskManager* manager, uint which); |
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}; |
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// |
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// RefProcTaskProxy |
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// |
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// This task is used as a proxy to parallel reference processing tasks . |
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// |
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class RefProcTaskProxy : public GCTask { |
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typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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ProcessTask & _rp_task; |
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uint _work_id; |
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public: |
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RefProcTaskProxy(ProcessTask & rp_task, uint work_id) |
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: _rp_task(rp_task), |
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_work_id(work_id) |
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{ } |
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private: |
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virtual char* name() { return (char *)"Process referents by policy in parallel"; } |
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virtual void do_it(GCTaskManager* manager, uint which); |
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}; |
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// |
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// RefEnqueueTaskProxy |
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// |
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// This task is used as a proxy to parallel reference processing tasks . |
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// |
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class RefEnqueueTaskProxy: public GCTask { |
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typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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EnqueueTask& _enq_task; |
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uint _work_id; |
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public: |
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RefEnqueueTaskProxy(EnqueueTask& enq_task, uint work_id) |
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: _enq_task(enq_task), |
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_work_id(work_id) |
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{ } |
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virtual char* name() { return (char *)"Enqueue reference objects in parallel"; } |
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virtual void do_it(GCTaskManager* manager, uint which) |
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{ |
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_enq_task.work(_work_id); |
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} |
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}; |
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// |
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// RefProcTaskExecutor |
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// |
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// Task executor is an interface for the reference processor to run |
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// tasks using GCTaskManager. |
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// |
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class RefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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virtual void execute(ProcessTask& task); |
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virtual void execute(EnqueueTask& task); |
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}; |
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// |
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// StealMarkingTask |
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// |
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// This task is used to distribute work to idle threads. |
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// |
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class StealMarkingTask : public GCTask { |
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private: |
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ParallelTaskTerminator* const _terminator; |
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private: |
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public: |
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char* name() { return (char *)"steal-marking-task"; } |
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StealMarkingTask(ParallelTaskTerminator* t); |
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ParallelTaskTerminator* terminator() { return _terminator; } |
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virtual void do_it(GCTaskManager* manager, uint which); |
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}; |
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// |
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// StealRegionCompactionTask |
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// |
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// This task is used to distribute work to idle threads. |
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// |
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class StealRegionCompactionTask : public GCTask { |
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private: |
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ParallelTaskTerminator* const _terminator; |
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public: |
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StealRegionCompactionTask(ParallelTaskTerminator* t); |
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char* name() { return (char *)"steal-region-task"; } |
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ParallelTaskTerminator* terminator() { return _terminator; } |
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virtual void do_it(GCTaskManager* manager, uint which); |
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}; |
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// |
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// UpdateDensePrefixTask |
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// |
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// This task is used to update the dense prefix |
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// of a space. |
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// |
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class UpdateDensePrefixTask : public GCTask { |
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private: |
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PSParallelCompact::SpaceId _space_id; |
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size_t _region_index_start; |
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size_t _region_index_end; |
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public: |
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char* name() { return (char *)"update-dense_prefix-task"; } |
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UpdateDensePrefixTask(PSParallelCompact::SpaceId space_id, |
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size_t region_index_start, |
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size_t region_index_end); |
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virtual void do_it(GCTaskManager* manager, uint which); |
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}; |
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// |
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// DrainStacksCompactionTask |
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// |
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// This task processes regions that have been added to the stacks of each |
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// compaction manager. |
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// |
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// Trying to use one draining thread does not work because there are no |
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// guarantees about which task will be picked up by which thread. For example, |
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// if thread A gets all the preloaded regions, thread A may not get a draining |
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// task (they may all be done by other threads). |
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// |
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class DrainStacksCompactionTask : public GCTask { |
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public: |
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char* name() { return (char *)"drain-region-task"; } |
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virtual void do_it(GCTaskManager* manager, uint which); |
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}; |